| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Pressure-Induced Superconductivity in the Charge-Density-Wave Compound LaTe$_{2- x}$Sb$_{x}$ ($x = 0$ and 0.4) |
| Xu Chen1†, Pei-han Sun2†, Zhenkai Xie1,3†, Fanqi Meng1, Cuiying Pei4, Yanpeng Qi4,5,6, Tianping Ying1, Kai Liu2*, Jian-gang Guo1*, and Xiaolong Chen1,3* |
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, China
3University of Chinese Academy of Sciences, Beijing 100049, China
4School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
5ShanghaiTech Laboratory for Topological Physics, ShanghaiTech University, Shanghai 201210, China
6Shanghai Key Laboratory of High-resolution Electron Microscopy and ShanghaiTech Laboratory for Topological Physics, ShanghaiTech University, Shanghai 201210, China
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| Cite this article: |
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Xu Chen, Pei-han Sun, Zhenkai Xie et al 2023 Chin. Phys. Lett. 40 107402 |
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Abstract Magnetic CeTe$_{2}$ achieving superconductivity under external pressure has received considerable attention. The intermingling of 4$f$ and 5$d$ electrons from Ce raised the speculation of an unconventional pairing mechanism arising from magnetic fluctuations. Here, we address this speculation using a nonmagnetic 4$f$-electron-free LaTe$_{2}$ as an example. No structural phase transition can be observed up to 35 GPa in the in situ synchrotron diffraction patterns. Subsequent high-pressure electrical measurements show that LaTe$_{2}$ exhibits superconductivity at 20 Gpa with its $T_{\rm c}$ (4.5 K) being two times higher than its Ce-counterpart. Detailed theoretical calculations reveal that charge transfer from the 4$p$ orbitals of the planar square Te–Te network to the 5$d$ orbitals of La is responsible for the emergence of superconductivity in LaTe$_{2}$, as confirmed by Hall experiments. Furthermore, we study the modulation of $q_{\scriptscriptstyle{\rm CDW}}$ by Sb substitution and find a record high $T_{\rm c}^{\rm onset} \sim 6.5$ K in LaTe$_{1.6}$Sb$_{0.4}$. Our work provides an informative clue to comprehend the role of $5d$–$4p$ hybridization in the relationship between charge density wave (CDW) and superconductivity in these RETe$_{2}$ (RE = rare-earth elements) compounds.
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Received: 14 July 2023
Published: 11 October 2023
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| PACS: |
74.62.Fj
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(Effects of pressure)
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74.62.Bf
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(Effects of material synthesis, crystal structure, and chemical composition)
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74.25.Dw
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(Superconductivity phase diagrams)
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74.25.Jb
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(Electronic structure (photoemission, etc.))
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